mesh size

[Anne-Cecile Lesage]

Dear Dr Fang and all

I am calling the v2s function this way [node1,face1]=v2s(V,255,opt);

I get a mesh of 40000 nodes. How do i change the options to get a finer mesh?

Thank you

Best regards

Anne-Cecile Lesage

[Qianqian Fang]

hi Anne-Cecile,

40000 is the default maximum node number we allow cgalsurf to produce. you are getting 40000 nodes yet still have a coarse mesh indicates that you are running into a known convergence issue for at least the older versions of CGAL - I am not sure if this has been fixed. A list of documented discussions on this can be found at

https://github.com/fangq/iso2mesh/issues/5

basically when there are so called "non-manifold" structures at your chosen threadhold, cgal could get trapped in an infinite refinement loop, causing it to create extremely dense spots while not meshing other areas evenly.

you can change your thread-hod slightly, for example, instead of 0.5, give it 0.51, or 0.6 and see if it can get out of the infinite refinement loop

you can set the maxnode limit to a higher number, it it won't help you because it will continue refining the local area until the new limit is reached

https://github.com/fangq/iso2mesh/blob/master/vol2surf.m#L27

Qianqian

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